... Description hex head screw1)standard :GB,DIN,BS,ASTM,ISO,ANSI(IFI),JIS, and per specially design2)size:M3-M64 ,1/8 ... -3''3)length:5mm-250mm,1/4''--10''4)matrrial: brass,copper,bronze, silicon bronze, aluminium bronze, nickel bronze, phosphor bronze, manganese bronze,etc.5)finish: nickel, tin ...